Band power computation device and band power computation method
a computation device and band power technology, applied in the direction of electric devices, instruments, transportation and packaging, etc., to achieve the effect of reducing the amount of calculation necessary
Active Publication Date: 2015-04-09
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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AI Technical Summary
Benefits of technology
The invention aims to make it faster and more accurate to calculate channel power by extracting part of an input signal and applying Fourier transform to it. By extending and smoothing the channel power of the extracted signal, the invention achieves a level of accuracy that is similar to calculating channel power from the whole input signal. This results in a more efficient and accurate method for calculating channel power.
Problems solved by technology
Furthermore, what is problematic in speech coding and speech recognition is “environment noise” and techniques for removing this are also being actively studied.
Method used
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embodiment
Configuration of Band Power Calculation Apparatus
[0027]A configuration of band power calculation apparatus 100 according to an embodiment of the present invention will be described using FIG. 1. FIG. 1 is a block diagram illustrating the configuration of band power calculation apparatus 100 according to the present embodiment.
[0028]Band power calculation apparatus 100 is mainly configured of partial segment extraction section 101, window function storage section 102, windowing section 103, FFT section 104, power calculation section 105, extension section 106, smoothing section 107, band information storage section 108, and band division section 109. Power generating section 150 includes extension section 106 and smoothing section 107.
[0029]Partial segment extraction section 101 extracts part of an input signal. As an example, the present embodiment assumes the length of an input signal to be “256 samples” and the length of the extracted signal to be “128 samples” and assumes that th...
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A band power computation device with which the amount of calculation required to compute channel power is reduced, and with which it is possible to obtain channel power with the same precision as when the channel power is obtained from the entire input signal. With this device, a subspace extraction unit (101) extracts a portion of the input signal. An FFT unit (104) performs a Fourier transformation on the extracted signal, generating a spectrum signal. A power computation unit (105) computes the channel power for each frequency from the spectrum signal. A power generation unit (150) expands the channel power to the same channel power as the channel power computed from the input signal, and smoothes the expanded channel power by performing a calculation sequentially from the highest frequency to the lowest frequency, said calculation using the expanded channel power and a prescribed constant.
Description
TECHNICAL FIELD[0001]The present invention relates to a band power calculation apparatus and a band power calculation method.BACKGROUND ART[0002]In mobile communication, compression coding of digital information such as speech or image is indispensable for effective utilization of a transmission band. Among the compression coding techniques, there is a great expectation for a speech codec (coding / decoding) technique which is widely used for mobile phones, and there is a growing demand for higher sound quality in conventional high efficiency coding with a high compression rate. Since the speech codec technique is publicly used, its standardization is indispensable and because of the enormous impact of intellectual property involved, companies worldwide are actively engaged in research and development thereof. In recent years, ITU-T (International Telecommunication Union—Telecommunication Standardization Sector) or MPEG (Moving Picture Experts Group) have been studying standardization...
Claims
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Login to View More IPC IPC(8): G01R21/00
CPCG01R21/006G10L25/18G10L25/21
Inventor MORII, TOSHIYUKI
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA